Raith Rovers were knocked off the top of the Scottish Championship as Calum Gallagher's goal secured victory for Airdrieonians.
Gallagher struck with 17 minutes remaining to move Airdrie to within a point of fifth-placed Partick Thistle.
The forward had earlier threatened for the hosts, including a header just off target.
Dylan Easton could not find a leveller for the visitors and they slip a point below Dundee United.
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